Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'loongarch-fixes-6.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
Pull LoongArch fixes from Huacai Chen:
"Export smp_send_reschedule() for modules use, fix a huge page entry
update issue, and add documents for booting description"
* tag 'loongarch-fixes-6.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
docs/zh_CN: Add LoongArch booting description's translation
docs/LoongArch: Add booting description
LoongArch: mm: Fix huge page entry update for virtual machine
LoongArch: Export symbol for function smp_send_reschedule()
+119
-24
+42
Documentation/loongarch/booting.rst
+42
Documentation/loongarch/booting.rst
···
1
+
.. SPDX-License-Identifier: GPL-2.0
2
+
3
+
=======================
4
+
Booting Linux/LoongArch
5
+
=======================
6
+
7
+
:Author: Yanteng Si <siyanteng@loongson.cn>
8
+
:Date: 18 Nov 2022
9
+
10
+
Information passed from BootLoader to kernel
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+
============================================
12
+
13
+
LoongArch supports ACPI and FDT. The information that needs to be passed
14
+
to the kernel includes the memmap, the initrd, the command line, optionally
15
+
the ACPI/FDT tables, and so on.
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+
17
+
The kernel is passed the following arguments on `kernel_entry` :
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+
19
+
- a0 = efi_boot: `efi_boot` is a flag indicating whether
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+
this boot environment is fully UEFI-compliant.
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+
22
+
- a1 = cmdline: `cmdline` is a pointer to the kernel command line.
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+
24
+
- a2 = systemtable: `systemtable` points to the EFI system table.
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+
All pointers involved at this stage are in physical addresses.
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+
27
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Header of Linux/LoongArch kernel images
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=======================================
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+
30
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Linux/LoongArch kernel images are EFI images. Being PE files, they have
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+
a 64-byte header structured like::
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+
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u32 MZ_MAGIC /* "MZ", MS-DOS header */
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+
u32 res0 = 0 /* Reserved */
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+
u64 kernel_entry /* Kernel entry point */
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+
u64 _end - _text /* Kernel image effective size */
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+
u64 load_offset /* Kernel image load offset from start of RAM */
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+
u64 res1 = 0 /* Reserved */
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+
u64 res2 = 0 /* Reserved */
40
+
u64 res3 = 0 /* Reserved */
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+
u32 LINUX_PE_MAGIC /* Magic number */
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+
u32 pe_header - _head /* Offset to the PE header */
+1
Documentation/loongarch/index.rst
+1
Documentation/loongarch/index.rst
+48
Documentation/translations/zh_CN/loongarch/booting.rst
+48
Documentation/translations/zh_CN/loongarch/booting.rst
···
1
+
.. SPDX-License-Identifier: GPL-2.0
2
+
3
+
.. include:: ../disclaimer-zh_CN.rst
4
+
5
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:Original: Documentation/loongarch/booting.rst
6
+
7
+
:翻译:
8
+
9
+
司延腾 Yanteng Si <siyanteng@loongson.cn>
10
+
11
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====================
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+
启动 Linux/LoongArch
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====================
14
+
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:作者: 司延腾 <siyanteng@loongson.cn>
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:日期: 2022年11月18日
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+
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BootLoader传递给内核的信息
19
+
==========================
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+
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LoongArch支持ACPI和FDT启动，需要传递给内核的信息包括memmap、initrd、cmdline、可
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+
选的ACPI/FDT表等。
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+
24
+
内核在 `kernel_entry` 入口处被传递以下参数:
25
+
26
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- a0 = efi_boot: `efi_boot` 是一个标志，表示这个启动环境是否完全符合UEFI
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+
的要求。
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+
29
+
- a1 = cmdline: `cmdline` 是一个指向内核命令行的指针。
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+
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+
- a2 = systemtable: `systemtable` 指向EFI的系统表，在这个阶段涉及的所有
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+
指针都是物理地址。
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+
34
+
Linux/LoongArch内核镜像文件头
35
+
=============================
36
+
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+
内核镜像是EFI镜像。作为PE文件，它们有一个64字节的头部结构体，如下所示::
38
+
39
+
u32 MZ_MAGIC /* "MZ", MS-DOS 头 */
40
+
u32 res0 = 0 /* 保留 */
41
+
u64 kernel_entry /* 内核入口点 */
42
+
u64 _end - _text /* 内核镜像有效大小 */
43
+
u64 load_offset /* 加载内核镜像相对内存起始地址的偏移量 */
44
+
u64 res1 = 0 /* 保留 */
45
+
u64 res2 = 0 /* 保留 */
46
+
u64 res3 = 0 /* 保留 */
47
+
u32 LINUX_PE_MAGIC /* 魔术数 */
48
+
u32 pe_header - _head /* 到PE头的偏移量 */
+1
Documentation/translations/zh_CN/loongarch/index.rst
+1
Documentation/translations/zh_CN/loongarch/index.rst
-10
arch/loongarch/include/asm/smp.h
-10
arch/loongarch/include/asm/smp.h
···
78
78
*/
79
79
extern void show_ipi_list(struct seq_file *p, int prec);
80
80
81
-
/*
82
-
* This function sends a 'reschedule' IPI to another CPU.
83
-
* it goes straight through and wastes no time serializing
84
-
* anything. Worst case is that we lose a reschedule ...
85
-
*/
86
-
static inline void smp_send_reschedule(int cpu)
87
-
{
88
-
loongson_send_ipi_single(cpu, SMP_RESCHEDULE);
89
-
}
90
-
91
81
static inline void arch_send_call_function_single_ipi(int cpu)
92
82
{
93
83
loongson_send_ipi_single(cpu, SMP_CALL_FUNCTION);
+11
arch/loongarch/kernel/smp.c
+11
arch/loongarch/kernel/smp.c
···
149
149
ipi_write_action(cpu_logical_map(i), (u32)action);
150
150
}
151
151
152
+
/*
153
+
* This function sends a 'reschedule' IPI to another CPU.
154
+
* it goes straight through and wastes no time serializing
155
+
* anything. Worst case is that we lose a reschedule ...
156
+
*/
157
+
void smp_send_reschedule(int cpu)
158
+
{
159
+
loongson_send_ipi_single(cpu, SMP_RESCHEDULE);
160
+
}
161
+
EXPORT_SYMBOL_GPL(smp_send_reschedule);
162
+
152
163
irqreturn_t loongson_ipi_interrupt(int irq, void *dev)
153
164
{
154
165
unsigned int action;
+16
-14
arch/loongarch/mm/tlbex.S
+16
-14
arch/loongarch/mm/tlbex.S
···
10
10
#include <asm/regdef.h>
11
11
#include <asm/stackframe.h>
12
12
13
+
#define INVTLB_ADDR_GFALSE_AND_ASID 5
14
+
13
15
#define PTRS_PER_PGD_BITS (PAGE_SHIFT - 3)
14
16
#define PTRS_PER_PUD_BITS (PAGE_SHIFT - 3)
15
17
#define PTRS_PER_PMD_BITS (PAGE_SHIFT - 3)
···
138
136
ori t0, ra, _PAGE_VALID
139
137
st.d t0, t1, 0
140
138
#endif
141
-
tlbsrch
142
-
addu16i.d t1, zero, -(CSR_TLBIDX_EHINV >> 16)
143
-
addi.d ra, t1, 0
144
-
csrxchg ra, t1, LOONGARCH_CSR_TLBIDX
145
-
tlbwr
146
-
147
-
csrxchg zero, t1, LOONGARCH_CSR_TLBIDX
139
+
csrrd ra, LOONGARCH_CSR_ASID
140
+
csrrd t1, LOONGARCH_CSR_BADV
141
+
andi ra, ra, CSR_ASID_ASID
142
+
invtlb INVTLB_ADDR_GFALSE_AND_ASID, ra, t1
148
143
149
144
/*
150
145
* A huge PTE describes an area the size of the
···
286
287
ori t0, ra, (_PAGE_VALID | _PAGE_DIRTY | _PAGE_MODIFIED)
287
288
st.d t0, t1, 0
288
289
#endif
289
-
tlbsrch
290
-
addu16i.d t1, zero, -(CSR_TLBIDX_EHINV >> 16)
291
-
addi.d ra, t1, 0
292
-
csrxchg ra, t1, LOONGARCH_CSR_TLBIDX
293
-
tlbwr
290
+
csrrd ra, LOONGARCH_CSR_ASID
291
+
csrrd t1, LOONGARCH_CSR_BADV
292
+
andi ra, ra, CSR_ASID_ASID
293
+
invtlb INVTLB_ADDR_GFALSE_AND_ASID, ra, t1
294
294
295
-
csrxchg zero, t1, LOONGARCH_CSR_TLBIDX
296
295
/*
297
296
* A huge PTE describes an area the size of the
298
297
* configured huge page size. This is twice the
···
433
436
ori t0, ra, (_PAGE_VALID | _PAGE_DIRTY | _PAGE_MODIFIED)
434
437
st.d t0, t1, 0
435
438
#endif
439
+
csrrd ra, LOONGARCH_CSR_ASID
440
+
csrrd t1, LOONGARCH_CSR_BADV
441
+
andi ra, ra, CSR_ASID_ASID
442
+
invtlb INVTLB_ADDR_GFALSE_AND_ASID, ra, t1
443
+
436
444
/*
437
445
* A huge PTE describes an area the size of the
438
446
* configured huge page size. This is twice the
···
468
466
addu16i.d t1, zero, (PS_HUGE_SIZE << (CSR_TLBIDX_PS_SHIFT - 16))
469
467
csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
470
468
471
-
tlbwr
469
+
tlbfill
472
470
473
471
/* Reset default page size */
474
472
addu16i.d t0, zero, (CSR_TLBIDX_PS >> 16)